A bogey followed at No. 12, when he decided to chip instead of putt from the front fringe and knocked it 8 feet past the cup. He saved par out of the greenside bunker at the par-3 13th by hitting inside 3 feet before two more birdies, with approach shots inside 10 feet at Nos. 14 and 15. And the closing birdie to lead alone.

“I always like having a shot in hand,” Mickelson said. “I set a goal to try to shoot 4 under on the backside, and I needed that putt to do it.”

Pampling rolled in 17-foot birdies at Nos. 1 and 3, then knocked his tee shot at the long par-3 inside 4 feet. When he made an 8-footer at No. 14, he was 12 under.

But Pampling caught a bit of bad luck on the par-3 16th when the green didn’t hold his tee shot, then he two-putted from 19 feet after chipping back. His tee shot at the 17th was way right into the trees, through he managed to get his second shot into a greenside bunker.

“If you look at the end of the day, and were told that’s what you were going to shoot, you would have been very happy,” said Pampling, adding that he wasn’t aware of the course record. “I was just trying to do my thing and just play golf.”

Gay, whose only PGA victory came at the Mayakoba Golf Classic in February in his 293rd tournament, was leading at 10 under after his 16-foot putt at the 432-yard 7th was his fourth birdie of the round.

Gay was still bogey-free at Colonial — through 44 holes — until his approach at No. 9 went into a greenside bunker. He blasted inside 8 feet, but two-putted from there. He dropped another shot at par-5 11th, where he three-putted from less than 10 feet.

“I felt like I was playing pretty well. I made some mistakes that cost me,” Gay said. “I still feel like I’ve got a chance. I just need to recharge for tomorrow.”

Divots: First-round leader Johnson Wagner took a triple-bogey at No. 5 after he knocked his tee shot at the course’s longest par-4 (472 yards) out of bounds into the trees along the Trinity River. He followed with a three-putt bogey at 6 on the way to a 73, and was nine strokes back. ... Quigley started with an eagle 3 at No. 1 when he holed a 68-foot shot from a bunker, then had two 25-foot birdies on the next two holes. His only non-par after that was a bogey at 17. He shot 67 and was at 206.

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